From: | Peter Geoghegan <pg(at)heroku(dot)com> |
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To: | Josh Berkus <josh(at)agliodbs(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Anssi Kääriäinen <anssi(dot)kaariainen(at)thl(dot)fi>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Kevin Grittner <kgrittn(at)ymail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: INSERT ... ON CONFLICT {UPDATE | IGNORE} |
Date: | 2014-12-05 18:07:17 |
Message-ID: | CAM3SWZRmkVqmRCs34YtZPOCn+HmHqtcdEmo6==nqz1kNA43DVw@mail.gmail.com |
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On Fri, Dec 5, 2014 at 10:00 AM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
> I thought the point of INSERT ... ON CONFLICT update was so that you
> didn't have to care if it was a new row or not?
>
> If you do care, it seems like it makes more sense to do your own INSERTs
> and UPDATEs, as Django currently does.
>
> I wouldn't be *opposed* to having a pseudocolumn in the RETURNed stuff
> which let me know updated|inserted|ignored, but I also don't see it as a
> feature requirement for 9.5.
Agreed. Importantly, we won't have painted ourselves into a corner
where we cannot add it later, now that RETURNING projects updates
tuples, too (V1.5 established that). I'm pretty confident that it
would be a mistake to try and make the inner "excluded" and "target"
aliases visible, in any case, because of the annoying ambiguity it
creates for the common, simple cases. I think it has to be a magic
function, or something like that.
I really hoped we'd be having a more technical, implementation level
discussion at this point. Simon rightly emphasized the importance of
getting the semantics right, and the importance of discussing that up
front, but I'm concerned; that's almost all that has been discussed
here so far, which is surely not balanced either.
--
Peter Geoghegan
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